If you want to change the wallpaper that sits in the background of your Mac’s login screen in OS X Leopard and Snow Leopard, from the Finder hit Command+Shift+G to open the ‘Go to Folder’ screen. Type /System/Library/CoreServices/ and click ‘Go’:

Next, find the image file called ‘DefaultDesktop.jpg’ – you should save a copy of this somewhere safe, or rename it to DefaultDesktop-backup.jpg or something of the sort, so that you can revert your changes.

After that file is safely backed up, add the new wallpaper image you want to use as the login background, naming it exactly the same as the previous file: DefaultDesktop.jpg

That’s all there is to it! Reboot and your login wallpaper is now whatever you set it to. This works to change the login background in Mac OS X Snow Leopard 10.6

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does anyone else think it’s weird that Apple doesn’t allow this as a customization option in their Appearance settings? They’re so into personalization, seems out of place to not allow the wallpaper to change on boot.

Hello, this is Youtube.com My crew and I wanted to say that this is all very correct, what your trying to say. Nice answer! We all will put this on our site blog, and make sure we spread the word! Thanks, and have a great day!

This doesn’t work for me. I’m running 10.7.8 Snow Leopard. Login Screen background turns blue. When I put copy of original back it works. What else should I be doing because everything up until I test it follows this example. Thanks.